Metallurgy - Mechanical Engineering test questions

Metallurgy - Mechanical Engineering test questions

1) In steel, the pearlite phase is made up of alternate layers of

a) Cementite and martensite
b) Ferrite and martensite
c) Ferrite and cementite
d) Cementite and bainite

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2) Babbit is an alloy of

a) Sn and Cu
b) Cu and Zn
c) Sn, Cu, Sb, and Pb
d) Sn, Cu and Pb

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3) Fatigue strength is least affected by

a) Magnitude of mean stress
b) Stress concentration
c) Frequency
d) Temperature

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4) Good impact strength indicates

a) Good creep resistance
b) Good wear resistance
c) Good ductility
d) Good fatigue behaviour

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5) Which among the following type is magnetic allotrope of iron?

a) α
b) β
c) γ
d) λ

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6) For which of the following reasons is manganese is alloyed with low carbon steels?

a) To make them tough and hard
b) To increase corrosion resistance
c) To raise tensile strength
d) To improve machinability

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7) Which of the following is a copper free alloy?

a) Muntz metal
b) German silver
c) Gun metal
d) White metal

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8) Chisel used for cutting steel sheets is usually

a) Normalised
b) Annealed
c) Hardened
d) Hardened and tempered

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9) Which surface hardening process gives maximum hardness to the surface?

a) Cyaniding
b) Pack hardening
c) Nitriding
d) Induction hardening

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10) The metallic structure of mild steel is

a) Hexagonal closed packed
b) Cubic
c) Face centred cubic
d) Body centred cubic

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11) Which of the following statements is incorrect regarding ‘tempering’?

a) It improves ductility
b) It releases stresses
c) It improves machinability
d) It reduces hardness and brittleness

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12) The product of cupola is called as

a) Cast iron
b) Wrought iron
c) Mild steel
d) Pig iron

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13) Pearlite appears as ……….. under microscope.

a) White
b) Dark
c) Light
d) Finger print

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14) What do you mean by hardenability of steel?

a) Ability to withstand shocks
b) Ability of steel to resist abrasion, wear and penetration
c) Property which determines the depth of the hardened zone induced by quenching
d) None of the above

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15) How can the recrystallization temperature be lowered?

a) By grain refinement
b) By purification of metals
c) By working at lower temperature
d) All of the above

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16) Which of the following statements is correct regarding ‘diamagnetic materials’?

a) These can be magnetised by eddy currents
b) These can be magnetised in one direction only
c) These are magnetised in direction opposite to that of the applied field
d) None of these

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17) Cold worked components are generally subjected to

a) Normalising
b) Tempering
c) Hardening
d) Annealing

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18) Line imperfection in case of a crystal is also called as

a) Schottkv defect
b) Frenkel defect
c) Edge dislocation
d) None of these

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19) The maximum hardenability of any steel depends on

a) Chemical composition
b) Grain size
c) Carbon content
d) Alloying elements

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20) Which among the following is a correct statement?

a) A completely brittle metal will not fracture at elastic limit
b) In elastic materials, yield stress and tensile strength are practically identical
c) A metal which is brittle in tension may be ductile under hydrostatic compression
d) All materials undergo plastic deformation

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21) The correct statement in case of thermosetting plastics is

a) They are produced on synthesis basis
b) They soften on heating and can be moulded again
c) They permanently set with heat and cannot be deformed on heating it again
d) None of these

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22) Austenite is a solid solution of carbon in

a) λ iron
b) α iron
c) γ iron
d) β iron

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23) Gibb’s phase rule is given by

Where, F = number of degrees of freedom; C = number of components; n = number of external factors; P = number of phases in equilibrium

a) F = C + n – P
b) F = C + 2n – P
c) F = C + 2n + P
d) F = C + n – 2P

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24) Which of the following statements is correct regarding ‘subzero treatment of steel’?

a) It is used to reduce the retained austenite in hardened steel
b) It is used to suppress martensite transformation
c) It is performed after hardening operation to induce temper brittleness
d) All of the above

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25) Mechanical properties of steel castings can be improved by which of the following heat treatment processes?

a) Phase annealing
b) Incomplete hardening
c) Tempering
d) All of the above

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26) Rockwell reading is a measure of the penetration caused by

a) Minor load only
b) Major load only
c) Both minor load and major lad
d) None of the above

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27) Structure of hypereutectoid steels comprises

a) Cementite only
b) Phases of cementite and pearlite
c) Pearlite only
d) Phases of ferrite and cementite

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28) In 18-4-1 HSS, what is the percentage of chromium?

a) 1%
b) 4%
c) 18%
d) Cannot be determined

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29) Addition of sulphur to steel increases

a) Wear resistance
b) Corrosion resistance
c) Machinability
d) Hardness

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30) What is Bakelite?

a) A silicon varnish
b) A catalyst
c) A thermoplastic resin
d) A phenol formaldehyde resin

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